feat(suite): confirm AI writing cost before request

tests/test_cmhub_models.py

@@ -8,6 +8,9 @@ from app import cmhub_models
 
 
 class CMHubModelDisplayTests(unittest.TestCase):
+    def tearDown(self):
+        cmhub_models.clear_model_catalog_cache()
+
     def test_alias_label_prefers_display_name_tier_and_points(self):
         label = cmhub_models.alias_label(
             {
@@ -44,6 +47,72 @@ class CMHubModelDisplayTests(unittest.TestCase):
         self.assertIn("生图别名 image-hd", summary)
         self.assertIn("扣点以返回结果为准", summary)
 
+    def test_catalog_price_only_accepts_one_unconditional_matching_vision_model(self):
+        models = [
+            {
+                "alias": "vision-standard",
+                "operation_type": "vision",
+                "requires_image": True,
+                "pricing_status": "priced",
+                "prices": [{"points_cost": 2}],
+            }
+        ]
+
+        cmhub_models.cache_model_catalog("https://CMHUB.example.com/", models, now=100)
+        cached = cmhub_models.cached_model_catalog(
+            "https://cmhub.example.com",
+            "vision-standard",
+            now=120,
+        )
+
+        self.assertEqual("2", cmhub_models.format_points_cost(
+            cmhub_models.unambiguous_points_cost(
+                cached,
+                "vision-standard",
+                "vision",
+                requires_image=True,
+            )
+        ))
+
+    def test_catalog_price_rejects_conditional_missing_or_ambiguous_prices(self):
+        base = {
+            "alias": "vision-standard",
+            "operation_type": "vision",
+            "requires_image": True,
+            "pricing_status": "priced",
+        }
+        cases = [
+            dict(base, prices=[{"resolution": "1K", "points_cost": 2}]),
+            dict(base, prices=[{"points_cost": 2}, {"points_cost": 3}]),
+            dict(base, pricing_status="unpriced", prices=[{"points_cost": 2}]),
+            dict(base, requires_image=False, prices=[{"points_cost": 2}]),
+            dict(base, prices=[{}]),
+        ]
+        for model in cases:
+            with self.subTest(model=model):
+                self.assertIsNone(
+                    cmhub_models.unambiguous_points_cost(
+                        [model],
+                        "vision-standard",
+                        "vision",
+                        requires_image=True,
+                    )
+                )
+
+        cmhub_models.cache_model_catalog(
+            "https://cmhub.example.com",
+            [dict(base, prices=[{"points_cost": 2}])],
+            now=100,
+        )
+        self.assertIsNone(
+            cmhub_models.cached_model_catalog(
+                "https://cmhub.example.com",
+                "vision-standard",
+                max_age_seconds=20,
+                now=121,
+            )
+        )
+
 
 if __name__ == "__main__":
     unittest.main()